Emit debug info for global constants whose address is taken exactly once.

Add a check to the DeclCache before emitting debug info for a
GlobalVariable a second time and just attach the previsously created one to it.

<rdar://problem/26721101>

llvm-svn: 286322

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index b17d2482a78..c4e7ffdd54e 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -3675,6 +3675,13 @@ void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
   assert(DebugKind >= codegenoptions::LimitedDebugInfo);
   if (D->hasAttr<NoDebugAttr>())
     return;
+
+  // If we already created a DIGlobalVariable for this declaration, just attach
+  // it to the llvm::GlobalVariable.
+  auto Cached = DeclCache.find(D->getCanonicalDecl());
+  if (Cached != DeclCache.end())
+    return Var->addDebugInfo(cast<llvm::DIGlobalVariable>(Cached->second));
+
   // Create global variable debug descriptor.
   llvm::DIFile *Unit = nullptr;
   llvm::DIScope *DContext = nullptr;